11-29-11, 03:03 PM | #1 | |
Supreme EcoRenovator
Join Date: Mar 2009
Location: Portland, OR
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Low Temperatuer Heating and High Temperature Cooling
The idea of low temperature heating and high temperature cooling (AKA: low exergy heating and cooling) has interested me for a few years now.
Today I came across a report regarding a novel design for heat exchangers that uses fine wires. Here is a quote from the report on fine wire heat exchangers (AKA: Fiwihex): Quote:
It is important in that it pertains to solar water and space heating. Solar heating is regarded as low temperature heating. Conventional thinking is that when a reservoir of solar heated water becomes lower in temperature than 115F degrees, it is of little use in space heating. With attention to low temperature heating approaches, the minimum useful temperature can be significantly less than 115F degrees.It is also important to heat pumps, both ASHP and GSHP, since the higher temperature that a heat pump is called on to create (AKA: the higher the lift), the lower it's efficiency. Another important possibility that low exergy places before us is the direct use of geothermal warmth and coolness, without the need of a heat pump for heating or air conditioning. * * * Information in the US about low exergy heating and cooling is not so easy to come by. There was an initiative started about 15 years ago by a group of mostly northern European countries to study this approach and to share information. The US was invited to become a member and/or to become a financial contributor to this initiative, but the US declined on both accounts. The European consortium maintains a web site HERE. [* DEAD LINK There is an interesting page on the site called The Guidebook that may serve as an introduction. *] NOTE: This material is dissappearing form the Internet. However, I have been able to drag a full PDF copy if the Guidebook from the dustbin of history HERE. There are books on the subject, but they are very expensive. Almost no libraries in the US carry books on this subject. Perhaps we can share information here... Best, -AC_Hacker
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I'm not an HVAC technician. In fact, I'm barely even a hacker... Last edited by AC_Hacker; 02-22-15 at 11:56 AM.. |
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